Welded steel pipe, also known as welded pipe, is a steel pipe made by welding a steel plate or a steel strip after crimping. Welded steel pipe production process is simple, high production efficiency, variety specifications, less equipment, but the general strength is lower than the seamless steel pipe. Since the 1930s, with the rapid development of high-quality strip and strip production and the progress of welding and inspection technology, the quality of welded joints has been continuously improved, the varieties and specifications of welded steel pipes have been increasing, and more and more fields have been replaced by no Steel pipe. Welded steel pipe according to the form of weld is divided into straight seam welded pipe and spiral welded pipe.

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